How do I stop my cats from thinking they are dogs?

homeowner

God-damn cats are ruining my stuff. First it was my high heel boots, and now its my house itself.

My cats have decided that they enjoy ripping the screens out of our windows. Tonight I came in to find my cat in the third floor window systematically ripping a HUGE hole in the screen. I don't know if this has come from their new-found favorite pastime of chasing the flying insects, but its going to make summer here (with the one AC in the entire house and the huge mutant mosquitos) pretty bad.

Any suggestions on how to get them to stop? I can't afford to replace all the screens just to have them ripped apart again. Not to mention, the wanton destruction of personal property agrieves me considering they live rent-free. :evil: